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A discussion of scale effects on hydraulic conductivity at a granitic site (El Berrocal, Spain)
Author(s) -
Guimerà J.,
Vives L.,
Carrera J.
Publication year - 1995
Publication title -
geophysical research letters
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 2.007
H-Index - 273
eISSN - 1944-8007
pISSN - 0094-8276
DOI - 10.1029/95gl01493
Subject(s) - hydraulic conductivity , scale (ratio) , geology , conductivity , soil science , hydrology (agriculture) , geomorphology , geotechnical engineering , mineralogy , soil water , physics , quantum mechanics
Scale effects on hydraulic conductivity (i.e. increase in the value of K with increasing scale of measurement) have been reported in the literature. Here, we summarize extensive tests performed at El Berrocal, a granitic site in Central Spain, to study whether such effects indeed appear. In fact, median hydraulic conductivities clearly increase with measurement scale. We argue, however, that large scale measurements may be biased towards high K values because they are performed in the most permeable zones, where pumping rates can be high. This is supported by the fact that cross‐hole transmissivities and hydraulic conductivities consistently fall below the corresponding values at the pumping interval.